jumbo jellyfish joy

allegedly an even smaller contender for smallest fish

Originally Posted by a vivid case of sexual dimorphism

This 46-millimeter-long (1.8-inch-long) female Photocorynus spiniceps has what looks like a small nub in the middle of her back. Actually, that's a 6.2-mllimeter-long (0.24-inch-long) male — a claimant to the title of the world's smallest known, sexually mature vertebrate.